title: Periodic dielectric structures for light-trapping in InGaAs/GaAs quantum well solar cells.
abstract: We study dielectric diffraction gratings for light-trapping in quantum well solar cells and compare their performance with plasmonic and Lambertian light-trapping structures. The optimum structural parameters are identified for symmetric uni-periodic, symmetric bi-periodic and asymmetric bi-periodic gratings. The enhancement in short-circuit current density from the quantum well region with respect to a reference cell with no diffraction grating is calculated. The ratio of this enhancement to the maximum achievable enhancement (i.e. no transmission losses) is 33%, 75% and 74%, respectively for these structures. The optimum asymmetric and symmetric bi-periodic structures perform closest to Lambertian light-trapping, while all three optimum grating structures outperform optimum plasmonic light-trapping. We show that the short-circuit current density from the quantum well region is further enhanced by incorporating a rear reflector.
authors.forename: Sam
authors.initials: S
authors.lastname: Turner
authors.forename: Sudha
authors.initials: S
authors.lastname: Mokkapati
authors.forename: Greg
authors.initials: G
authors.lastname: Jolley
authors.forename: Lan
authors.initials: L
authors.lastname: Fu
authors.forename: Hark Hoe
authors.initials: HH
authors.lastname: Tan
authors.forename: Chennupati
authors.initials: C
authors.lastname: Jagadish